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As a solutions architect, recommend a highly available, fault-tolerant, and scalable solution to replace two NAT instances that can no longer support the company's application traffic requirements.
A
Replace with two NAT gateways in the same Availability Zone.
B
Implement Auto Scaling groups and Network Load Balancers for NAT instances across different Availability Zones.
C
Replace with two NAT gateways in different Availability Zones.
D
Switch to Spot Instances with a Network Load Balancer across different Availability Zones.